Tegiwa Primary Cat Delete Decat Pipes for the BMW M3 E90, E92, E93 (S65)

The primary catalysts are the biggest restriction in the E9X M3 exhaust, and the Tegiwa pipes replace them directly. They use a slip-on clamp design, so it is a straightforward DIY fit. Tegiwa measured a gain of 20 bhp and 20 lb-ft (27 Nm).

Specifications

Which cars it fits

• BMW M3 E90 saloon, E92 coupe, E93 convertible (S65 engine)

What to check

• The OEM front wire gaskets are reusable.
• An ECU remap is needed to clear the engine warning light and adds further power.
• It removes the catalytic converter: a competition part, and the car is no longer road legal.